I just did a Vienna / Simcoe SMASH. I'm calling it a VS Imperial 1/2 SMASH. I went (way too) big on the first addition of simcoe 1oz 13.7% / 60min. Then .5oz/15min, .5oz/FO, and .5oz dryhop (I'm at day 3 of 10). Oh, yea this is a 2.5 gallon batch!
So with IBUs at around 120, I took a sip just before pitching and panic'd. At hige krausen I decided to add 1lb of cane sugar and 1/2lb clover honey (the only fermentables I had on hand) to help the gravity catch up with the bitterness.
I was thinking to blend it with a light 2-row...but after a taste this evening, the dryhopping is helping and at 1.004 I'm calculating 8.27%ABV. I think with a little time it will work out fine. The Vienna is probably saving me here as it is retaining some maltiness considering the sugar addition and low FG.
I think simcoe/vienna can make for a good SMASH, go for it. I'm going to do this again and change the first addition to .5 oz and the last addition to 1oz and look to hit a OG of around 1.067.